Zuckerberg is aiming to become president. They might not even need to pay him (outside of political favors, I'd imagine), because he's probably convinced he's building it for his future self.
While I cannot condone or support the recently publicized explicit depictions my opponent claims to the subject of, both myself and the people at Facebook have the utmost respect for user privacy. As always users are encouraged to create locally computed perceptual hash values of the content in question using the publically available SDK tools and submit them to the proper support channel for assistance.
He doesn't need to; if he / they want to, they can already exert more influence on the world than the US itself does. Facebook's population dwarfs that of the US.